Here is my weekly weather quiz question. What is a “Thalweg?” Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. Good luck.

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An upper level high pressure ridge (“Arch” shape in blue arrows) is setting itself up off the Pacific Coast to bring us sunshine and much warmer temperatures. A frontal system will be pushing through Oregon by next Sunday. It looks like another frontal system will be heading our way next Tuesday. You may just want to check out this year’s Perseid Meteor Shower which peaks from Thursday August 10th through Sunday August 13th. It is predicted that you could see up to 200 “shooting stars” per hour from debris from the comet Swift-Tuttle. Best viewing is late at night to before sunrise. Make sure you are out far enough away from the city lights so the sky looks darker a and the meteorites will be more easily seen.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 16 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A Blue-Green Algae health advisory is in effect for Odell Lake in Lane County. Water testing has confirmed the presence of blue-green algae and the toxins they produce. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.
• A Blue-Green Algae health advisory remains in effect for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake ONLY. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.

 

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly sunny and a bit warmer today, clear at night,
• Then sunny and warmer Thursday and Friday and clear both nights.
• highs 85-95 lows 54-56.
• Mostly sunny and a bit cooler Saturday and Sunday, mostly clear Saturday night, clear Sunday evening, partly cloudy late at night,
• Partly cloudy Monday AM, sunny and a bit warmer Monday afternoon and Tuesday, clear Monday night.
• highs 92-84 warming to 88 Tuesday lows near 56. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count:

Grass………. Low (0)

Trees………. Low (0)

Last Counted: 8/5/16

Data Courtesy of Oregon Allergy Associates.

The Grass and Tree Pollen season is officially over now.

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Forecast for Roseburg:

• Partly cloudy this AM, sunny and a bit warmer this afternoon, mostly clear in the evening, partly cloudy late tonight,
• AM clouds, then sunny and a bit warmer Thursday afternoon and Friday, mostly clear Friday night,
• highs 86-99 lows 57-62.
• Mostly sunny but a bit cooler Saturday and Sunday, mostly clear both nights,
• Partly cloudy Monday AM, then sunny and a bit warmer Monday afternoon and Tuesday, mostly clear Monday night.
• highs 94-86 warming to 89 Tuesday lows near 58. (seasonal averages high 86 low 56)

 

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy this AM, sunny this afternoon, mostly clear in the evening, mostly cloudy late tonight,
• Mostly cloudy in the AM, sunny Thursday afternoon, mostly clear at night,
• Mostly sunny Friday, then mostly clear Friday night.
• highs near 69 lows 54-56.
• Partly cloudy Saturday through Monday AM, sunny Monday afternoon, mostly clear at night,
• Then mostly sunny Tuesday.
• highs near 66 lows near 55. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit warmer today, clear tonight,
• Sunny and a bit warmer Thursday and Friday, clear both nights.
• free air freezing level 12,000 ft. today, 14,000 ft. tonight, 15,000 ft. Thursday and Thursday night, then 16,000 ft. Friday and Friday night.
• highs 72-85 lows 45-52.
• Mostly sunny and a bit cooler Saturday and Sunday, partly cloudy Saturday night, clear Sunday night,
• Then sunny and a bit warmer Monday and Tuesday, clear Monday night.
• free air freezing level 16,000 ft. Saturday, 15,000 ft. Saturday night, 14,000 ft. Sunday, 15,000 ft. Sunday night and Monday, then 16,000 ft. Monday night and Tuesday.
• highs 84-74 warming to 78 Tuesday lows 47-45 warming to 47 Monday night.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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